Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Caterpillars, maggots, grubs, and similar immature insects - 1/4 inch - 1/2 inch long > Squash vine borer
Squash vine borer
Melitta curcurbitae
Jeff Hahn, University of Minnesota Extension
Description: Up to 1 inch long.
Where/When: Commonly attacks summer squash, winter squash and pumpkins. Cucumbers and melons are less frequently affected. The larva is active from mid-July through August.
Significance: Serious pest of vine crops. The larva feeds through the center of the stems, blocking the flow of water to the rest of the plant. Plants become wilted, may collapse, and ultimately die.
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